WO2021113664A1 - Appareil et procédé pour tester l'intégrité d'un emballage - Google Patents

Appareil et procédé pour tester l'intégrité d'un emballage Download PDF

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Publication number
WO2021113664A1
WO2021113664A1 PCT/US2020/063350 US2020063350W WO2021113664A1 WO 2021113664 A1 WO2021113664 A1 WO 2021113664A1 US 2020063350 W US2020063350 W US 2020063350W WO 2021113664 A1 WO2021113664 A1 WO 2021113664A1
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WO
WIPO (PCT)
Prior art keywords
package
vacuum
vacuum chamber
chamber
tank
Prior art date
Application number
PCT/US2020/063350
Other languages
English (en)
Inventor
Brian HAUG
Original Assignee
Haug Quality, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Haug Quality, Inc. filed Critical Haug Quality, Inc.
Priority to CA3158270A priority Critical patent/CA3158270A1/fr
Publication of WO2021113664A1 publication Critical patent/WO2021113664A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
    • G01M3/363—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested the structure being removably mounted in a test cell
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
    • G01M3/10—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for containers, e.g. radiators
    • G01M3/103—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for containers, e.g. radiators for flexible or elastic containers

Definitions

  • the present invention is an apparatus and method for detecting packaging integrity.
  • the apparatus of the present invention generally relates to a new device for testing flexible packages for leak integrity, and to a new' method for testing flexible packages for leak integrity'.
  • a common type of package tested for seal integrity is a plastic package having three seals produced by overlapping a sheet of plastic and melting the plastic together. If the plastic is not properly melted due to the clamping force or heat applied, the seals may lack the integrity needed to properly protect the contents of the package from contamination. [0006] Efforts have been made to provide a nondestructive methodology for evaluation of packaged products of this type to determine if leaks exist, because the seal integrity is sensitive to changes in temperature, such as from a failing heating element, or changes in clamping force or clamping time.
  • Bubbles from leaks in the package are counted or captured in a graduated container providing an air over time leak rate. This test is often difficult to conduct since very small holes produce bubbles at a very low rate, thus increasing the opportunity for error because the leak may not be easily visible with the naked eye.
  • Another procedure for determining whether there are leaks in flexible packages is trace gas detection using positive pressure. This procedure involves the introduction of trace gases under pressure into a package to be tested. Again, the test breaks the seal integrity, making it a destructive test.
  • Another trace gas test provides detection in a partial vacuum.
  • packages are sealed in a trace gas environment and placed in a partial vacuum.
  • the amount of gas released from a package is monitored to determine whether a leak exists.
  • This test is destructive when the package contents are degraded by the gas and requires sensitive and expensive equipment. Environmental pollution of the test area and the item in the package can also occur, possibly resulting in false test responses.
  • Another known procedure for determining leaks is a vacuum decay test. In this test, a sample flexible package is placed in a first chamber of known volume. Pressure is drawn from the first chamber to a second chamber of known volume. As this is being done, the second chamber is measured for decay in vacuum that would be caused by a leak in the package.
  • Pack- Vac leak detector manufactured by Haug Quality Equipment, which uses a liquid immersion leak test that shows leaks via bubble emission, in compliance with ASTM standards.
  • a flexible package is submerged in a liquid inside of a vacuum chamber. The pressure inside the vacuum chamber is then lowered until the flexible package expands. Then, when the flexible package expands to the point of rigidity, the internal pressure, which is now higher than the surrounding pressure, will force the gas through any hole or defect and produce a telltale stream of bubbles that is visible to the naked eye.
  • the altitude and ambient pressure of the packaging plant also affect the vacuum or pressure levels needed for testing and can lead to inconsistent results as the ideal vacuum at one facility is not the same as at another facility.
  • the below described new' apparatus and method was developed to overcome these flaws inherent in tiie existing testing methods.
  • the present vacuum testing method and apparatus allow for consistent test results by overcoming the problems inherent in existing testing systems.
  • the present apparatus overcomes the above described problems by applying vacuum to the flexible package until the package reaches a predetermined size, rather than a set vacuum level. This allows the new testing method to be tailored to a specific package without regard to the volume of air contained in the package or the ambient pressure of the testing facility because the ideal size of the package is the size at which the internal pressure is sufficient to force internal gas through any holes existing in the packaging.
  • the new apparatus avoids problems with changes in elevation and varying volumes of gas inside the flexible packaging.
  • test apparatus can made in a variety of forms, as will be obvious to anyone skilled in the art.
  • the test apparatus consists of a tank or vacuum chamber, with at least one transparent viewing port, through which a flexible package inside the vacuum chamber may be viewed.
  • a hold down plate is attached to a top panel of tiie vacuum chamber, so that when the vacuum chamber is partially filled with water, or another suitable liquid, the flexible package is held completely submerged in the liquid.
  • a measuring plate, attached to at least one guide rod, is placed in the vacuum chamber such that it will contact one side of the flexible package when the package is held down by the hold down plate.
  • a measuring device is attached to the measuring plate in a way that allows the measuring device to measure the movement of the measuring plate as it travels along the guide rods.
  • the measuring device may be a simple scale printed on the side of the vacuum chamber, an electronic measuring device, or an artificial intelligence (“AI”) assisted measuring device.
  • AI artificial intelligence
  • the testing apparatus then holds the flexible package size constant by electronically adjusting the vacuum levels using an electronic control system in conjunction with the measuring device.
  • the electronic control system may be any type commonly used in industry and may include the following components: a programmable logic controller (“PLC”), a programmable automation controller (“PAC”), an industrial personal computer (“IPC”), a microcontroller, a supervisory control and data acquisition (“SCADA”) system, or other industrial control systems known to those skilled in the art.
  • PLC programmable logic controller
  • PAC programmable automation controller
  • IPC industrial personal computer
  • SCADA supervisory control and data acquisition
  • the above embodiment may be modified to omit the electronic control system and instead use a manual control system whereby an operator of the test apparatus manually adjusts the vacuum applied to tiie chamber based on the measurements output by the measuring device.
  • the test apparatus consists of a vacuum chamber, with at least one viewing port, through which a flexible package inside the vacuum chamber may be viewed.
  • a hold down plate is attached to a top panel of the vacuum chamber, so that when the vacuum chamber is partially filled with water, or another suitable liquid, the flexible package is held completely submerged in the liquid.
  • the expansion of the flexible package is measured using a photoelectric sensor.
  • the photoelectric sensor emits a beam of light across the vacuum chamber at a predetermined level. As the flexible package expands, it will interrupt the photoelectric sensor light beam when it reaches a predetermined size.
  • the testing apparatus then holds the flexible package size constant by electronically adjusting the vacuum levels using an electronic control system.
  • the test apparatus consists of a vacuum chamber, with at least one viewing port, through which a flexible package inside the vacuum chamber may be viewed.
  • a hold down plate is attached to a top panel of the vacuum chamber, so that when the vacuum chamber is partially filled with water, or another suitable liquid, the flexible package is held completely submerged in the liquid.
  • the expansion of the flexible package is measured using a vision sensor in conjunction with AI leak detection.
  • the vision sensor and AI measure the size of the package and automatically adjust the vacuum applied to the flexible package to maintain its predetermined size.
  • the AI scans the information provided by the vision sensor to detect visual indications of leaks.
  • this embodiment may use multiple vision sensors to accurately detect leaks from any location on the flexible package regardless of its size. Furthermore, this embodiment eliminates the need for operator to visually inspect each package as this can be done using tiie AI, which then flags suspect packages for operator review.
  • One possible embodiment of the testing method using the above apparatus is: opening the vacuum chamber to insert a flexible package that has been filled with product and a compressible fluid. Next, the flexible package is inserted into the vacuum chamber and placed under the hold down plate while the top lid is closed. Then, the measurement plate, if not already in position, is positioned such that it contacts the flexible package and that any dimensional change of the flexible package will move the measurement plate.
  • the vacuum is applied to the interior of the vacuum chamber, causing the flexible package to expand as the internal pressure of the flexible package increases relative to the pressure inside the vacuum chamber. As the pressure differential increases, the flexible package will become more rigid and thus push against the measurement plate and hold down plate. Because the hold down plate is fixed in position, the change in dimensions of the flexible package moves the measurement plate. Once the measurement plate reaches a predetermined point, the vacuum is adjusted to maintain the predetermined size. Depending on the embodiment, the flexible package size may be maintained manually by an operator or by an electronic control system. Next, depending on the embodiment, the operator or an electronic measuring device inspects the flexible package in the vacuum chamber for evidence of leaks, such as air bubbles escaping the flexible package.
  • tiie apparatus for vacuum testing packaging comprises a tank with an interior chamber, a lid operable to allow placement of a package into the interior chamber, a hold down plate attached to the lid, a measuring device configured to measure the size of the package, and a vacuum device configured to apply vacuum to the interior chamber of the tank.
  • the apparatus may further comprise at least one viewing aperture in the tank, wherein the interior chamber may be viewed through the viewing aperture.
  • the apparatus may further comprise a floating plate movably attached to at least one guide rod, wherein the measuring device is further configured to measure the location of the floating plate.
  • the measuring device may comprise at least one of a group consisting of a photoelectric sensor, a laser sensor, a vision sensor, an artificial intelligence assisted vision sensor, a mechanical sensor, or a visual scale.
  • the vacuum device may comprise at least one of a group consisting of a positive displacement pump, momentum transfer pump, regenerative pump, entrapment pump, a venturi vacuum pump, or steam ejector.
  • the apparatus may further comprise a liquid contained within the interior chamber of the tank and a vision sensor operable to detect a gas escaping from the package into the liquid.
  • the vision sensor may be assisted by artificial intelligence in detecting the gas escaping from the package.
  • the following is one possible method for vacuum testing comprising inserting a package containing a mixture of a product and a fluid in a gaseous phase into a vacuum chamber, filling the vacuum chamber with a predetermined amount of a fluid in a liquid phase, holding the flexible package submersed in the liquid fluid, sealing the vacuum chamber, applying vacuum to the vacuum chamber until the flexible package reaches a predetermined size and inspecting the flexible package for indications of leakage.
  • the liquid fluid used in this comprises at least one liquid fluid selected from a group consisting of water, oil, ethylene glycol, propylene glycol, or alcohol.
  • the inspection used in this method comprises at least one of a group consisting of an inspection of the vacuum chamber using vision sensor, an inspection of the vacuum chamber using an artificial intelligence assisted vision sensor, or an inspection of the vacuum chamber by a human observer.
  • FIG. 1 is an isometric view of one possible embodiment of the Testing Apparatus Vacuum Chamber.
  • FIG. 2 is an isometric view of one possible embodiment of the Testing Apparatus Internal Fixture.
  • FIG. 3 is a front view of one possible embodiment of the Testing Apparatus
  • FIG. 4 is a section view of one possible embodiments of the Testing Apparatus Vacuum Chamber with Internal Fixture during testing.
  • FIG. 5 is a section view of one possible embodiment of the Testing Apparatus Vacuum Chamber with Internal Fixture and Electronic Sensors.
  • FIG. 6 is a section view of one possible embodiment of the Testing Apparatus Vacuum Chamber with Internal Fixture and Vision Sensor.
  • FIG. 7 is a section view of one possible embodiment of the Testing Apparatus Vacuum Chamber with Electronic Sensors and without Internal Fixture.
  • FIG. 8 is a section view of one possible embodiment of the Testing Apparatus Vacuum Chamber with Internal Fixture and a Mechanical Limit Switch.
  • FIG. 9 is a section view of one possible embodiment of tire Testing Apparatus Vacuum Chamber with a Mechanical Limit Switch and without Internal Fixture.
  • tire present apparatus consists of a tank 101, which may be transparent or contain viewing ports, that is partially filled with liquid water or another suitable transparent liquid 102.
  • the apparatus also includes a removable lid 104 with a hold down plate 103, which may consist of a perforated structure attached to the interior side of the removable lid 104.
  • the hold down plate 103 acts to submerge a package 105 when the removable lid 104 is in a closed position.
  • An internal fixture, located within the tank 101 and shown in isolation in Figs. 2 and 3, is constructed of a floating plate 107 that can move on a guide rod 109, which allows the floating plate 107 to move linearly without skewing.
  • a measuring device 108 monitors the vertical location of the floating plate 107.
  • the floating plate 107 will contact the hold down plate 103 when the lid is closed and there is no package 105 inside. This empty position is considered the "zero" measurement, wherefrom all other measurements may be taken.
  • the package 105 is inserted into tiie main chamber of the tank 101. Once the removable lid 104 is moved to the closed position, the package 105 is held in a submerged position by the hold down plate 103. As the package 105 is being submerged by tiie hold down plate 103, the package 105 pushes the floating plate 107 downward. Once the floating plate 107 reaches a stable position, an initial measurement of the size of tiie package 105 may be taken. Next, vacuum is applied to the interior of the tank 101 to decrease the pressure around tiie package 105.
  • the measuring device 108 As the pressure decreases around tiie package 105, gas inside the package 105 will expand in volume forcing the package 105 to become rigid while expanding in size, thereby moving the floating plate 107 away from the hold down plate 103.
  • the measuring device 108 is triggered. Once triggered, the measuring device 108 may automatically adjust the vacuum to maintain the package 105 at the predetermined size. Alternatively, the measuring device 108 may alert an operator to manually adjust the vacuum once the package 105 has reached a predetermined size.
  • a visual scale 114 may also be included, or used to replace tiie measuring device 108, to allow an operator to visually measure the size of the package 105. Having the visual scale 114 in addition to the measuring device 108 is beneficial because it allows the operator to confirm the readings received from the measuring device
  • the pressure differential (“Delta- P”) between the interior of the package 105 and the interior of the tank 101 increases to a level sufficient to force gas from the interior of the package 105 through holes or other defects in the package 105.
  • this semi-rigid state is reached, any leaks in the package 105 will produce a visual indication of gas escaping into the interior of the tank 101 in the form of bubbles 113, which can be visually detected by an operator or by electronic sensors.
  • Fig. 5 illustrates other possible embodiments of the present apparatus using different measuring devices.
  • the apparatus consists of a tank 501 containing a liquid 502 and has a lid 504 with a hold down plate 503 attached.
  • a package 505 is placed inside the tank 501 and is held in a submerged position by the hold down plate 503.
  • the interior of the tank 501 is then placed under vacuum, and gas inside the package 505 will expand in volume, thereby forcing the package 505 to expand in size.
  • a laser 511 or other photoelectric sensor, may be mounted horizontally so that it will trigger when the floating plate 507 passes a predetermined location due to the expansion of the package 505.
  • a distance measuring laser 512 may be mounted under the floating plate 507. Mounted in this orientation, the distance measuring laser 512 measures the movement of the floating plate 507 as the package 505 expands in size. For illustrative purposes the distance measuring laser 512 is shown under the floating plate 507. However, as will be obvious to anyone skilled in the art, the distance measuring laser 512 may be mounted in any location that allows it to measure the movement of the floating plate, including on the floating plate 507 itself.
  • a visual scale 514 may be included, in any embodiment, so that an operator of the machine may take manual measurements of the movement of the measuring plate 507.
  • Fig. 6 illustrates another possible embodiment of the present apparatus wherein the apparatus consists of a tank 601 containing a liquid 602 and has a lid 604 with a hold down plate 603 attached.
  • the apparatus consists of a tank 601 containing a liquid 602 and has a lid 604 with a hold down plate 603 attached.
  • a package 605 is placed inside the tank 601 and is held in a submerged position by the hold down plate 603.
  • the interior of the tank 601 is then placed under vacuum, and gas inside the package 605 will expand in volume, thereby forcing the package 605 to expand in size and moving a floating plate 607.
  • a vision sensor 610 capable of detecting gas moving through the liquid 602 is mounted so that it can detect the package 605.
  • the vision sensor 610 is positioned so that it can detect any bubbles 613 escaping the package 605, once the package 605 reaches a predetermined size.
  • the vision sensor may be assisted by an artificial intelligence capable of taking the inputs delivered by the vision sensor 610 and interpreting them so that the bubbles 613 may be more accurately detected.
  • Fig. 7 illustrates another possible embodiment of the present apparatus without a measuring plate.
  • the apparatus consists of a tank 701 containing a liquid 702 and has a lid 704 with a hold down plate 703 attached.
  • a package 705 is placed inside the tank 701 and is held in a submerged position by the hold down plate 703.
  • the size of the package 705 is directly measured by a horizontally mounted laser 711 or using a distance measuring laser 712 mounted below the package 705.
  • the laser 711 and distance measuring laser 712 may be mounted in numerous orientations, and the shown and described locations should be taken as merely exemplary.
  • a visual scale 714 may be included so that an operator of the apparatus may take manual measurements.
  • Figs. 8 illustrates another possible embodiment the present apparatus with a mechanically actuated limit switch 815.
  • the apparatus consists of a tank 801 containing a liquid 802 and has a lid 804 with a hold down plate 803 attached.
  • a package 805 is placed inside the tank 801 and is held in a submerged position by the hold down plate 803.
  • the interior of the tank 801 is then placed under vacuum, and gas inside the package 805 will expand in volume, thereby forcing the package 805 to expand in size and move a floating plate 807.
  • tire package 805 is held down by the hold down plate 803. Then as vacuum is applied to the main chamber of the tank 801 and the package 805 reaches a predetermined size, tire floating plate 807 triggers tire limit switch 815.
  • the illustrated embodiment of the apparatus does not include a floating plate. Instead, the limit switch 915 is directly triggered by a package 905 as the package 905 reaches a predetermined size under vacuum.
  • the embodiment illustrated in Fig. 9 is similar to previous embodiments and tire apparatus consists of a tank 901 containing a liquid 902 and has a lid 904 with a hold down plate 903 attached. During operation, the package 905 is placed inside the tank 901 and is held in a submerged position by the hold down plate 903. The interior of the tank 901 is then placed under vacuum, and gas inside the package 905 will expand in volume, thereby forcing the package 905 to expand in size, thereby triggering the limit switch 915.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un appareil et un procédé pour tester l'intégrité d'un emballage à l'aide d'un vide. L'appareil est constitué d'un réservoir doté d'une chambre intérieure, d'un couvercle permettant de placer un emballage dans la chambre intérieure, d'une plaque de maintien fixée au couvercle, d'un dispositif de mesure conçu pour mesurer la taille de l'emballage, et d'un dispositif à vide conçu pour appliquer un vide à la chambre intérieure de la chambre à vide. Pendant le test, l'emballage est immergé dans un liquide, puis placé sous vide jusqu'à ce qu'une taille prédéfinie soit atteinte. Ensuite, l'emballage est inspecté à la recherche de signes de fuite.
PCT/US2020/063350 2019-12-05 2020-12-04 Appareil et procédé pour tester l'intégrité d'un emballage WO2021113664A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA3158270A CA3158270A1 (fr) 2019-12-05 2020-12-04 Appareil et procede pour tester l'integrite d'un emballage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16/705,090 2019-12-05
US16/705,090 US11112329B2 (en) 2019-12-05 2019-12-05 Apparatus and method for testing package integrity

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WO2021113664A1 true WO2021113664A1 (fr) 2021-06-10

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US (1) US11112329B2 (fr)
CA (1) CA3158270A1 (fr)
WO (1) WO2021113664A1 (fr)

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CN114623981A (zh) * 2022-03-23 2022-06-14 成都理工大学 基于机器视觉静动态密封测试方法
CN117213740B (zh) * 2023-11-08 2024-02-13 山东优生医疗科技有限公司 一种生化检测试剂盒密封性检测装置

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CA3158270A1 (fr) 2021-06-10
US11112329B2 (en) 2021-09-07
US20210172822A1 (en) 2021-06-10

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